EP 0369412 B1 19960911 - Fluid pressure controller
Title (en)
Fluid pressure controller
Title (de)
Fluiddruckregler
Title (fr)
Appareil de commande de pression de fluide
Publication
Application
Priority
- JP 12754589 A 19890519
- JP 15486989 A 19890616
- JP 28808588 A 19881114
Abstract (en)
[origin: EP0369412A2] A fluid pressure controller includes a housing formed with an input port, a discharge port and an output port, a spool axially slidably mounted in a bore provided in the housing, a spring for keeping the spool in its inoperative position, and an electricity/power converter for imparting to the spool an axial driving force corresponding to the amplitude of an electric signal applied to the converter. First and second chambers are defined by the inner peripheral surface of the bore and both end faces of the spool. The spool is formed with an internal passage connecting the first and second chambers together and having its intermediate portion throttled to form a fixed-size orifice and with a peripheral channel at a point between the first chamber and the fixed-size orifice so as to communicate with the internal passage. The output port normally communicates with the second chamber. The spool is movable among a first position where the peripheral channel communicates with the input port, a second position where it is shut off from both the input port and the output port and a third position where it communicates with the discharge port. Thus when the output port is brought into commnication with either the input port or the discharge port through the peripheral channel, hydraulic fluid will flow through the fixed-size orifice, thereby creating a pressure difference at both ends of the orifice, the pressure difference being equal to the output of the converter minus the biasing force of the spring.
IPC 1-7
IPC 8 full level
B60T 8/00 (2006.01); B60T 8/36 (2006.01); B60T 8/42 (2006.01); B60T 8/48 (2006.01); B60T 8/50 (2006.01); B60T 13/68 (2006.01); G05D 16/20 (2006.01)
CPC (source: EP KR US)
B60T 8/00 (2013.01 - EP US); B60T 8/364 (2013.01 - EP US); B60T 8/3665 (2013.01 - EP US); B60T 8/4275 (2013.01 - EP US); B60T 8/4809 (2013.01 - EP US); B60T 8/50 (2013.01 - KR); B60T 8/5025 (2013.01 - EP US); B60T 8/5093 (2013.01 - EP US); B60T 13/686 (2013.01 - EP US); G05D 16/20 (2013.01 - KR); G05D 16/2024 (2018.12 - EP US)
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
EP 0369412 A2 19900523; EP 0369412 A3 19911106; EP 0369412 B1 19960911; DE 68927150 D1 19961017; DE 68927150 T2 19970410; KR 900008354 A 19900604; KR 930001020 B1 19930212; US 5018797 A 19910528
DOCDB simple family (application)
EP 89121093 A 19891114; DE 68927150 T 19891114; KR 890016477 A 19891114; US 43583689 A 19891114